Slider for slide fasteners



A H. SCHNFELDER 2,675,595

SLIDER FOR SLIDE FASTENERS April 2o, 1954 Filed 001:. 4. 1951 t ep A Patented Apr. 20, 1954 OFFICE SLIDER Fon SLIDE FAsTENERs Herbert Schnfelder, Stolberg, Rhineland am Bauschenberg, Germany Application October 4, 1951, Serial No. 249,645

1 Claim.

The invention relates to sliders for opening and closing slide fasteners, especially sliders with a locking device preventing the unvoluntary opening of the fastener. Sliders for slide fasteners with or without locking device are mostly made of sheet metal or also by pressure casting (chiefly of Zinc) It is known that there are sliders, the locking device of which consists of a loop, Whose one end falls in the locking position as locking tooth between two elements of the slide fastener. In these sliders the loop rests on the upper wing of the slider, and a spring presses the loop into the locking position. The slider is usually operated by means of a pull tab which mostly acts upon the loop, so that the locking tooth of the slider is lifted against the said spring, when the slider is moved by means of the pull tab in order to open the slide fastener.

The slider according to the invention consists of two wings held in parallel position by means of a yoke, forming the guide and the core of the slider, and of a loop having at its one end a locking tooth, protruding through an aperture in the upper wing into the interior of the slider and penetrating at the other` end through another aperture into the interior of the slider, with this aperture forming a pivot for the loop. There is, therefore, no special device required to keep the loop in place, whilst with known sliders hinges, pins o-r points and sockets are used to keep the loop in place.

Another feature of the invention is that the slider is bent out of one piece of sheet metal in such a way as to form when bent two parallel slider wings connected by a yoke somewhat U- shaped in cross-section, with the core of the slider being formed by two flanges in a lateral position to the yoke; these anges are bent inwards and preferably contain a spring, which presses the rear end of the loop upwards and thus the locking tooth downwards.

In order to prevent the locking loop from being torn upwards out of the slider wing, its locking tooth is fitted with two lateral projections, the maximum distance of which exceeds the aperture of the wing through which the locking tooth passes. These projections, therefore, press against the slider wing from underneath. To enable thern to pass through the aperture the front end of the loop is provided with an adequate indentation.

The drawing shows a preferred embodiment of the invention.

Fig. 1 is a perspective view of the slider.

Fig. 2 is a longitudinal sectional view through the slider taken along lines II-II of Fig. 3.

Fig. 3 is a longitudinal sectional view through the slider taken along lines III-III of Fig. 2.

Fig. 4 is a pre-shaped piece of sheet metal for the manufacture of the slider body.

Fig. 5 is a perspective View of the loop of the slider.

The body of the slider is formed out of one piece of sheet metal shown in Fig. 4. This piece of sheet metal contains the upper slider wing I, the lower slider wing 2 and a yoke 3 with the lateral tongues 4 and 5. The wings I and 2 are of the same form and possess at their longitudinal edges upright walls Ia, Ib and 2a, 2b respectively. The upper wing I has at its end opposite to the yoke 3, the front end, an aperture 6 and in the vicinity of the yoke 3 an aperture 'I.

The piece of sheet metal shown in Fig. 4 is bent round the yoke 3 in such a way as to bring the two wings I and 2 into parallel relation to each other at a distance corresponding to the thickness of the slide fastener. To facilitate the bending operation and to prepare the form of the core the yoke 3 is pushed outward along the dot and dash line 8 of Fig. 4. Before bending the iianges 4, 5 are bent inward, so that they are in approximately parallel relation to each other, as shown by the dotted lines at 4a and 5a in Fig. 3.

A small pressure spring S is inserted between the anges l and 5 and the projection I0a of the loop I0 shown in Fig. 5 is pushed through the aperture l. Thereafter, the fianges 4 and 5 are pressed together, so that their ends touch each other and the flange 4 is brought into parallel relation to the edge 2a and the flange 5 into parallel relation to the edge 5a.. The flanges II, 5 thus form the expanding wedge (the core) of the slider. The spring 9 thus presses the projection Illa against the upper wing I and in doing so turns the loop I0, with the edge 'la of the aperture I serving as a pivot. At its other end Ib the loop I0 has a locking tooth I I, which reaches through aperture 6 into the interior of the slider, thus pressing on the 'closed slide fastener guided therein and preventing its being automatically opened.

The locking tooth I I is tted with t-wo lateral projections IIa, I Ib. 'I'he external distance from each other of these projections is bigger than the aperture E in wing I. In order to enable the locking tooth II with its projections IIa, IIb to pass through the aperture 6, the end I0b is fitted with an indentation I Ic. By tilting the loop I0 the locking tooth II with its projections IIa, I Ib can be introduced into the aperture 6.

At the aperture 8 the wing I has an upward Having thus described the invention, what is claimed is:

In a slider for slide fasteners and the like, in combination, a one-piece, substantially U-shaped member having opposite wings facing each other and interconnected at one end of said member by a yoke portion thereof, said member including a pair of projections extending respectively from opposite sides of said yoke portion into the space between said wings and approaching each other to form a wedge-shaped guide for the slide fastener, one of said wings being formed with a rst opening at an end portion thereof distant from said yoke and with a second opening located` between said first opening and said yoke; a twoarmed lever extending at an intermediate part thereof through said second opening, having one of its arms located between said one Wing and said projections and extending from said second opening toward said yoke and the other of the arms of said lever extending over said one wing, at the side thereof opposite from the other of said wings, from said second opening toward said rst opening, said other arm of said lever having a free end portion extending through said rst opening to- Ward said other wing and having a tooth at the extremity thereof, and said lever engaging an edge portion of said one wing at said second opening thereof so that said edge portion forms a fulcrum for said lever; and a spring located between said projections, abutting at one end against said other Wing, and abutting at an opposite end against said one arm of said lever.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,967,137 Sundback July 17, 1934 2,057,126 Wintritz Oct. 13, 1936 2,171,455 Roadfuss Aug. 29, 1939 2,373,523 Winterhalter Apr. 10, 1945 2,450,550 Griffen Oct. 5, 1948 2,523,740 Ulrich Sept. 26, 1950 FOREIGN PATENTS Number Country Date 34,947 France Oct. 10, 1929 

